Import Geant4 11.0.0.beta source tree

2021-06-25 16:12:29 +02:00
parent c968e26a39
commit 6399a014b6
4200 changed files with 207479 additions and 237366 deletions
@@ -0,0 +1,127 @@
+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// Abstract base class for multibody "phase space" generators.  Subclasses
+// implement a specific algorithm, such as Kopylov, GENBOD, or Makoto's
+// NBody.  Subclasses are used by G4HadPhaseSpaceGenerator.
+//
+// Author:	Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
+
+#include "G4VHadDecayAlgorithm.hh"
+#include "G4HadronicException.hh"
+#include "G4PhysicalConstants.hh"
+#include "G4SystemOfUnits.hh"
+#include "G4ThreeVector.hh"
+#include "Randomize.hh"
+#include <algorithm>
+#include <iostream>
+#include <iterator>
+#include <numeric>
+#include <vector>
+
+
+// Initial state (rest mass) and list of final masses
+
+void G4VHadDecayAlgorithm::Generate(G4double initialMass,
+				    const std::vector<G4double>& masses,
+				    std::vector<G4LorentzVector>& finalState) {
+  if (verboseLevel) G4cout << GetName() << "::Generate" << G4endl;
+
+  // Initialization and sanity check
+  finalState.clear();
+  if (!IsDecayAllowed(initialMass, masses)) return;
+
+  // Allow different procedures for two-body or N-body distributions
+  if (masses.size() == 2U) 
+    GenerateTwoBody(initialMass, masses, finalState);
+  else 
+    GenerateMultiBody(initialMass, masses, finalState);
+}
+
+
+// Base class does very simple validation of configuration
+
+G4bool G4VHadDecayAlgorithm::
+IsDecayAllowed(G4double initialMass,
+	       const std::vector<G4double>& masses) const {
+  G4bool okay =
+    (initialMass > 0. && masses.size() >= 2 &&
+     initialMass >= std::accumulate(masses.begin(),masses.end(),0.));
+
+  if (verboseLevel) {
+    G4cout << GetName() << "::IsDecayAllowed? initialMass " << initialMass
+	   << " " << masses.size() << " masses sum "
+	   << std::accumulate(masses.begin(),masses.end(),0.) << G4endl;
+
+    if (verboseLevel>1) PrintVector(masses," ",G4cout);
+
+    G4cout << " Returning " << okay << G4endl;
+  }
+
+  return okay;
+}
+
+
+// Momentum function (c.f. PDK() function from CERNLIB W515)
+
+G4double G4VHadDecayAlgorithm::TwoBodyMomentum(G4double M0, G4double M1,
+					       G4double M2) const {
+  G4double PSQ = (M0+M1+M2)*(M0+M1-M2)*(M0-M1+M2)*(M0-M1-M2);
+  if (PSQ < 0.) {
+    G4cout << GetName() << ":  problem of decay of M(GeV) " << M0/GeV 
+	   << " to M1(GeV) " << M1/GeV << " and M2(GeV) " << M2/GeV
+	   << " PSQ(MeV) " << PSQ/MeV << " < 0" << G4endl;
+    // exception only if the problem is numerically significant
+    if (PSQ < -CLHEP::eV) {
+      throw G4HadronicException(__FILE__, __LINE__,"Error in decay kinematics");
+    }
+
+    PSQ = 0.;
+  }
+
+  return std::sqrt(PSQ)/(2.*M0);
+}
+
+// Convenience functions for uniform angular distributions
+
+G4double G4VHadDecayAlgorithm::UniformTheta() const {
+  return std::acos(2.0*G4UniformRand() - 1.0);
+}
+
+G4double G4VHadDecayAlgorithm::UniformPhi() const {
+  return twopi*G4UniformRand();
+}
+
+
+// Dump contents of vector to output
+
+void G4VHadDecayAlgorithm::
+PrintVector(const std::vector<G4double>& v,
+	    const G4String& vname, std::ostream& os) const {
+  os << " " << vname << "(" << v.size() << ") ";
+  std::copy(v.begin(), v.end(), std::ostream_iterator<G4double>(os, " "));
+  os << std::endl;
+}